A simple method for residual stress measurements in thin films by means of focused ion beam milling and digital image correlation

Krottenthaler, Markus; Schmid, Christoph; Schaufler, Jens; Durst, Karsten; Göken, Mathias

doi:10.1016/j.surfcoat.2012.08.095

Cited by 73 publications

(29 citation statements)

References 13 publications

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“…DIC is a very useful non-contact optical method to measure displacement fields [40][41][42][43][44]. DIC has been employed in several studies, including those of the authors, to evaluate fracture responses of several materials [15,18,20,45,46].…”

Section: Use Of Digital Image Correlation (Dic) To Determine K Ic Andmentioning

confidence: 99%

Flexural fracture response of a novel iron carbonate matrix – Glass fiber composite and its comparison to Portland cement-based composites

Das

Hendrix

Stone

et al. 2015

Construction and Building Materials

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h i g h l i g h t sFracture response of a novel iron-based binder system brought out. Significantly higher fracture properties as compared to OPC systems. Superior influence of the unreacted metallic particles in the system elucidated. Digital image correlation method used for fracture property determination. a b s t r a c tThis paper explores the fracture properties of a novel and sustainable glass-fiber reinforced composite, the matrix for which is formed through the aqueous, anoxic, room-temperature carbonation of (waste) metallic iron powder along with other minor ingredients. A comparison of the properties of this binder with Ordinary Portland Cement pastes, which constitutes one of the most common and economic ceramic matrices is also provided. The iron-based binder system exhibits fracture parameters (fracture toughness, K IC S and critical crack tip opening displacement, CTOD C , determined using two parameter fracture model, TPFM) that are significantly higher when compared to those of the OPC systems in both the unreinforced and glass fiber reinforced states. The beneficial influence of the unreacted metallic iron particles of large aspect ratio, on the fracture parameters of iron-based binders are elucidated. The strain energy release rates show trends that are in line with the fracture parameters from TPFM. The elastic and inelastic components of strain energy release rate are separated in an effort to capture the fundamental toughening mechanisms in these systems. The fracture parameters determined using a non-contact, digital image correlation technique are found to relate well to those obtained from TPFM.

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Section: Use Of Digital Image Correlation (Dic) To Determine K Ic Andmentioning

confidence: 99%

Flexural fracture response of a novel iron carbonate matrix – Glass fiber composite and its comparison to Portland cement-based composites

Das

Hendrix

Stone

et al. 2015

Construction and Building Materials

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“…method for direct measurement of crack length and fracture properties. DIC is a speckle-tracking noncontact method to obtain displacement and strain fields on the specimen surface [14,45,46,68,69]. The surfaces of the specimens were first painted white and then random black speckles were made on the white surface using a black spray-paint to achieve a good contrast.…”

Section: Compressive and Flexural Strength Evaluationmentioning

confidence: 99%

Fracture response of metallic particulate-reinforced cementitious composites: Insights from experiments and multiscale numerical simulations

Nayak¹,

Krishnan²,

Das³

2019

Cement and Concrete Composites

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This paper presents an experimental and numerical investigation into the fracture response of mortars containing up to 30% waste iron powder by volume as OPC-replacement. The iron powdermodified mortars demonstrate significantly improved strength and fracture properties as compared to the control mortars due to presence of elongated iron particulates in the powder. With a view to develop a predictive tool towards materials design of such particulate-reinforced systems, fracture responses of iron powder-modified mortars are simulated using a multiscale numerical approach. The approach implements multi-scale numerical homogenization involving cohesive zone-based damage at the matrix-inclusion interface and isotropic damage in the matrix to obtain composite constitutive response and fracture energy. Consequently, these results serve as input to macro-scale XFEM-based three-point-bend simulations of notched mortar beams. The simulated macroscopic fracture behavior exhibit excellent match with the experimental results. Thus, the numerical approach links the material microstructure to macroscopic fracture parameters facilitating microstructure-guided material design.

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“…DIC is a non-contact optical speckle-tracking measurement method to obtain full-field surface displacements through successive post-processing of digital images taken at specific time intervals. The principle and applications of DIC are well documented [12,[18][19][20][21][22][23][24][25][26]. The surfaces of the beams were speckled to create random patterns.…”

Section: Digital Image Correlation (Dic) For Evaluation Of Fracture Pmentioning

confidence: 99%

Strain energy and process zone based fracture characterization of a novel iron carbonate binding material

Das

Stone

Mobasher

et al. 2016

Engineering Fracture Mechanics

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The fracture behavior of a novel structural binder developed using carbonation of metallic iron powder is investigated using notched beams under three-point bending. The iron-based binder demonstrates significantly higher fracture energies compared to conventional ordinary portland cement binders in both unreinforced and glass fiber-reinforced states. The influence of metallic iron particle inclusions and the carbonate binder on the strain energy release rates (R) and width of the fracture process zone (FPZ; which is the zone of strain localization at the tip of the crack) are evaluated and compared to that of portland cement-based binders. Tensile constitutive response of these binders is extracted using a crack-face bridging model. The control and fiber-reinforced iron-based binders demonstrate higher tensile strength and ultimate strain capacity as compared to conventional cementitious binders.

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A simple method for residual stress measurements in thin films by means of focused ion beam milling and digital image correlation

Cited by 73 publications

References 13 publications

Flexural fracture response of a novel iron carbonate matrix – Glass fiber composite and its comparison to Portland cement-based composites

Flexural fracture response of a novel iron carbonate matrix – Glass fiber composite and its comparison to Portland cement-based composites

Fracture response of metallic particulate-reinforced cementitious composites: Insights from experiments and multiscale numerical simulations

Strain energy and process zone based fracture characterization of a novel iron carbonate binding material

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